It's more than just a detective movie, in fact I would rather use the genre "human drama". It is so good and sad at the same time as it will always keep you guessing what will happen. If you are a fan of solving the crime saga this would be a good choice because it will not be easy to guess who is the criminal. The story can be confusing at times as they use a lot of flashback scenes. As this movie stars a lot of known actors and actress in Japan the acting is definitely a top notch. One advice; prepare a lot of tissues as you might really need it.